Answer: it will take 4.36 seconds to reach her average velocity 10.69 miles/hour.explanation: we have equation of motion
![s=ut+\frac{1}{2} at^2](/tex.php?f=s=ut+\frac{1}{2} at^2)
,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/s
![s=0*t+\frac{1}{2} *2.18*t^2](/tex.php?f=s=0*t+\frac{1}{2} *2.18*t^2)
![s=1.09t^2[/ 2equating equation 1 and 2 [tex]4.75t = 1.09t^2\\ \\ t=4.36 seconds.](/tex.php?f=s=1.09t^2[/ 2equating equation 1 and 2 [tex]4.75t = 1.09t^2\\ \\ t=4.36 seconds.)
so it will take 4.36 seconds to reach her average velocity 10.69 miles/hour.